您好:
20°15′24″×3
=60°45‘72’‘
=60°46’12‘’
56°47′+45°18′-74°30″
=101°65‘-74°30’‘
=27°64’30‘’
=25°4‘30’‘
不明白,可以追问
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20°15′24″×3+ 56°47′+45°18′-74°30″?
=60°45′72″+ 56°47′+45°18′-74°30″
=60°+45'+72″+ 56°+47′+45°+18′-74°-30″
=60°+ 56°+45°-74°+45'+47′+18′+72″-30″
=87°+60'+50'+42″
=87°+(60/60)°+50'+42"
=87°+1°+50'+42"
=88°+50'+42"
=88°50'42"